Q. A fighter aircraft is looping in a vertical plane. The minimum velocity at the highest point is (Given, r = radius of the loop)

3072 191 KEAMKEAM 2011Laws of Motion Report Error

A

$\frac{1}{2} g r$

9%

B

$2 g r$

15%

C

$g r$

54%

D

$3 g r$

14%

E

$4 g r$

14%

Solution:

$m g = \frac{m v ^{2}}{r}$
$v^{2} = g r$
$v = g r$